文献类型：期刊文献

英文题名：Integrated Reference Electrodes in Anion-Exchange-Membrane Electrolyzers: Impact of Stainless-Steel Gas-Diffusion Layers and Internal Mechanical Pressure

作者：Xu, Qiucheng[1,2];Oener, Sebastian Z.[1];Lindquist, Grace[1];Jiang, Hao[2];Li, Chunzhong[2];Boettcher, Shannon W.[1]

机构：[1]Univ Oregon, Dept Chem & Biochem, Eugene, OR 97403 USA;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2021

卷号：6

期号：2

起止页码：305

外文期刊名：ACS ENERGY LETTERS

收录：;EI(收录号：20210509859206);WOS:【SCI-EXPANDED(收录号:WOS:000619803400001)】；

基金：This work was supported by the U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) under the Fuel Cell Technologies Office (FCTO) under Award Number DE-EE0008841. Q.X. acknowledges the Program of China Scholarship Council, Excellent PhD Development Program from ECUST, and the Shanghai Scientific and Technological Innovation Project (18JC1410600) for additional support. Q.X. also thanks Lihaokun Chen assistance with the measurement setup. S.Z.O. acknowledges support from a research fellowship of the German Research Foundation (Deutsche Forschungsgemeinschaft) under project number 408246589 (OE 710/1-1). The work made use of shared facilities in the Center for Advanced Materials Characterization in Oregon (CAMCOR).

语种：英文

外文关键词：Ion exchange membranes - Proton exchange membrane fuel cells (PEMFC) - Hydrogen production - Steel fibers - Cathodes - Electrolysis - Stainless steel - Diffusion in gases - Costs - Durability - Electrolytic cells - Polarization

摘要：Alkaline-membrane electrolyzers operating in pure water might provide scalable low-cost H-2 production but currently lag in performance and durability compared to commercial technologies. Typically, membrane-electrode assemblies (MEAs) are optimized in electrolyzers by changing one parameter at a time and assessing the resulting system performance via two-electrode polarization and impedance measurements. These approaches are limited in their ability to assign performance changes and durability to specific electrodes or processes. We integrate a reference electrode with the MEA to separate anode and cathode responses in both polarization and impedance measurements. We illustrate the power of the approach by showing how the fiber diameter of stainless-steel gas-diffusion layers (GDLs) affects performance solely at the anode, while changing the thickness of the cathode GDL simultaneously affects the performance of the anode and cathode due to changes in internal pressure from mechanical compression. This finding was obscured in conventional two-electrode measurements. The work thus guides both high-performance alkaline-membrane water-electrolyzer development and illustrates a useful strategy to study structure-activity relationships in the MEA.